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SIGNALING 0N RAILWAYS.

No. 591,376. Patented Oct. 12,1897.

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ATTQRNEYS UNITED STATES PATENT ()FFIC AROHIBALD CAMPBELL TAIT BOND, OF LONDON, ENGLAND.

SIGNALING ON .-RAILWAYS.

SPECIFICATION forming part of Letters Patent No. 591,376, dated October 12, 1897. Application filed May 14, 1897- Serial No. 636,597. (No model.)

To all whom it may concern.-

Be it known that I, ARCHIBALD CAMPBELL TAIT BOND, a subject of the Queen of Great Britain and Ireland, anda resident of 3 Pemberton Gardens, St. J ohns Park, Holloway, London, England, have invented certain new and useful Improvements in and Connected with Signaling on Railways, of which the following is a specification.

The object of my invention is to provide an improved method of and means for signaling on railways, more especially in foggy weather, thus obviating the use of detonators.

In carrying my invention into effect I proceed in or in about the following manner, making reference to the accompanying sheet of drawings and diagrams, in which? Figure 1 shows the general arrangement 'in plan; Fig. 2, an end view, respectively, of the three contact or connecting wheels carried by the locomotive for the purpose of completing the electric circuit.

Similar letters refer to similar parts wherever appearing. 7

Between the ordinary rails or metals a are laid three insulated rails 1, 2, and 3 for such a distance as will enable a train to pull up before reaching the signal-postb. The rails 1, 2, and 3 are raised a few inches above the ordinary metals a to allow the connectingwheels carried on the engine, as hereinafter described, to clear the points.

In the signal-box or elsewhere suitably placed are two batteries or other sources of electricity 0 c The rails 1 and 2 are respectively connected with the and poles of the battery 0, (hereinafter referred to asthe safety-battery,) and the rails 2 and 3, respectively, with the and poles of the other battery 0, (hereinafter referred to as the danger-battery.) The poles of the safetybattery are connected with two terminals d d 4 on the side occupied by the signal-lever e when at danger, and the poles of the danger-battery are connected to the two terminals ff on the side occupied by the signal-lever when at safety. In other words, the wires connecting the danger-rails 2 and 3 with the battery 0 run to the terminals f f, placed at the safety position of the signallever, and those from the safety-rails l and 2 run to the'two terminals 01 d, placed at the danger position of the lever. The signal-lever e has a cross-bar g, so arranged that when brought over to the danger or safety positions the cross-bar will electrically connect the terminals on that side.

On any suitable part of the engine are placed two electric bells h h, of different tone, one denoting danger and the other safety. Each bell is brought into electrical connection with two of the insulated rails 1, 2, and 3 by means of two of three wheels 4 5 6, those for the danger-bell running on rails 2 and 3 and those for the safetybell running on rails l and 2. When contact takes place between the above mentioned Wheels 4 5 6 and the insulated rails l 2 3, either the danger or safety bell rings, according as the lever e occupies its safety or danger position. Thus assuming the lever e 'to be midway between its danger and safety positions and the wheels 4 5 6 to pass over the three rails 1 2 3, then both bells will ring, but on bringing the cross-bar 9 into its danger position and in contact with the terminals d d of thesafety-battery c the bell rung by rails 1 and 2 and wheels 4 and 5 will be silenced, owing to the current being shunted, thus allowing only the danger-bell to be rung by rails 2 and 3 and wheels 5 and 6, and vice versa, when the cross-bar is in its safety position and in contact with terminals 'ff of the danger-battery 0. So in whichever position may be the lever e the. driver is warned of the position of the signal, and this without either'signalman or driver having anything to do in addition to their ordinary work, as the simple act of putting the signal-lever e into its danger or safety position insures the ringing of the required bell when the engine passes over the three insulated rails 1, 2, and 3.

Having now described my invention, what I claim as new, and desire to secure by Let- 

